/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.http.fileupload.servlet;

import org.apache.tomcat.util.http.fileupload.FileUploadBase;
import org.apache.tomcat.util.http.fileupload.UploadContext;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.InputStream;

/**
 * <p>Provides access to the request information needed for a request made to
 * an HTTP servlet.</p>
 *
 * @since FileUpload 1.1
 */
public class ServletRequestContext implements UploadContext {

	// ----------------------------------------------------- Instance Variables

	/**
	 * The request for which the context is being provided.
	 */
	private final HttpServletRequest request;

	// ----------------------------------------------------------- Constructors

	/**
	 * Construct a context for this request.
	 *
	 * @param request The request to which this context applies.
	 */
	public ServletRequestContext(HttpServletRequest request) {
		this.request = request;
	}

	// --------------------------------------------------------- Public Methods

	/**
	 * Retrieve the character encoding for the request.
	 *
	 * @return The character encoding for the request.
	 */
	@Override
	public String getCharacterEncoding() {
		return request.getCharacterEncoding();
	}

	/**
	 * Retrieve the content type of the request.
	 *
	 * @return The content type of the request.
	 */
	@Override
	public String getContentType() {
		return request.getContentType();
	}

	/**
	 * Retrieve the content length of the request.
	 *
	 * @return The content length of the request.
	 * @since 1.3
	 */
	@Override
	public long contentLength() {
		long size;
		try {
			size = Long.parseLong(request.getHeader(FileUploadBase.CONTENT_LENGTH));
		} catch (NumberFormatException e) {
			size = request.getContentLength();
		}
		return size;
	}

	/**
	 * Retrieve the input stream for the request.
	 *
	 * @return The input stream for the request.
	 * @throws IOException if a problem occurs.
	 */
	@Override
	public InputStream getInputStream() throws IOException {
		return request.getInputStream();
	}

	/**
	 * Returns a string representation of this object.
	 *
	 * @return a string representation of this object.
	 */
	@Override
	public String toString() {
		return String.format("ContentLength=%s, ContentType=%s",
				Long.valueOf(this.contentLength()),
				this.getContentType());
	}

}
